Dead Pixel Checker

Test your monitor for dead or stuck pixels using solid full-screen color fills.

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Free Client-Side Private
Click screen to advance  ·  ← → to navigate  ·  ESC to exit
Click swatches to change color
How to check for dead or stuck pixels:
  1. Click Start Fullscreen Test to fill your screen with a solid color.
  2. Use the ← → arrow keys, click the screen, or use the on-screen buttons to cycle through colors.
  3. Look carefully across the entire screen for any pixel that does not match the background color.
  4. A dead pixel remains black on all colors. A stuck pixel stays a fixed color (red, green, or blue) regardless of the background.
  5. Press ESC or click Exit to leave the test.
🔒 This tool runs entirely in your browser — your files are never uploaded to any server.

Dead Pixel Checker fills your entire screen with a solid color so you can identify dead or stuck pixels on your monitor or laptop display. Cycle through black, white, red, green, blue, cyan, magenta, yellow, and gray to catch any pixel that fails to display the correct color.

How to Use

  1. Click Start Fullscreen Test to enter fullscreen mode.
  2. Inspect your screen carefully from corner to corner.
  3. Press the → arrow key or click the screen to advance to the next color.
  4. Press ← to go back to the previous color.
  5. Press Esc or click Exit in the on-screen menu to leave the test.

Color Tests

  • Black — dead pixels appear as bright dots of any color
  • White — dead pixels appear as dark or discolored dots
  • Red, Green, Blue — stuck pixels appear as a wrong-color dot
  • Cyan, Magenta, Yellow — catch pixels stuck on one of the primary channels
  • Gray — reveals subtle brightness or color uniformity issues

FAQ

What is a dead pixel?

A dead pixel is a screen pixel that no longer receives power and stays permanently black regardless of what the screen displays.

What is a stuck pixel?

A stuck pixel is a pixel that is frozen on one color — red, green, or blue — and does not change when the rest of the screen changes.

How many colors should I test?

Test all 9 colors for a thorough check. Black and white catch the most obvious faults; red, green, and blue reveal stuck sub-pixels; the mixed colors (cyan, magenta, yellow) catch single-channel faults that are easy to miss on primary colors.

Can this tool fix dead or stuck pixels?

No. This is a diagnostic tool only. Stuck pixels can sometimes be fixed with pixel-cycling software, but dead pixels are a hardware fault that cannot be corrected in software.

Does this tool work on any device?

Yes. It runs entirely in your browser with no installation required. It works on desktops, laptops, tablets, and phones.

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